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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdd1132596c2ea5be34f88503ae99a46d2749f4b393d2e0b87debbddb0f12ab2' 
  AND token = 'tupCE7fjQVrQsI8adJDyQipOMyomM4W9lEfuSBNY+1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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