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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f73e135421421e10c08b15e3cf339c1f4cab3d489faf3eae43e4c96a37dcb80' 
  AND token = '3djntknZRZ4DkqDC1fAB5+JFN0bY87EPbr6coF38WtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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