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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1e2377f2ac577a02d6bc914a736cd863df445d428f3cc35904c720a360d4c3' 
  AND token = '3t3/C0zVb8M72f2wUxLBZSPbUGD/rkPJnuRx+eH5LxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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