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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1aec0cdafd7e50d8aacccb42bbc550663c6638ce1b1c54988efedaa08bc42bf' 
  AND token = 'lYL10fjR8bJguNzlRosPdedbtvlWPzu97pVxXBNqCx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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