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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77dbf686beca19172f6d4a85b3ab909343df5f3a29b4abb3b6439b1f6a54d3d' 
  AND token = 'wzIypAfRpMUq1YIPsNaN/wetDipJz62SOKzcII7w1og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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