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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d36f4a34c06f25a54e0188c9bbda2a8e7f910f553829b042f6ca3b5c1483ad4' 
  AND token = '4Q9so95FqajHYGqHoA19EDnRh4GnGNNORAAKRSDkgxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}