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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf5275cd8e03e6a1b9ab183f2dc875f79ad99df87647e038281e61363ce11183' 
  AND token = 'PP4n1ByW78Wz9K+oXuN5DrKRrh44oHNFXFjAh3K42RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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