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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0552d9ce86c22a1f68663b2d13f6324f1bfe16a32a6ed2d156d3bba6bd8be6af' 
  AND token = 'EkC1Hio2fPEjYLllZcrqLsTQ8UeXUsv92xdnYlilJFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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