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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f38f891d2361fdedaeed08963902011bcf003040bbe99fe4e38ecbc334544561' 
  AND token = '0K055VlWyUZSLiV1ha0HI2PLUA7Xt9FHdPGyI9vAlWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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