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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0631e529bb1e5f08c2028c5111e2d24a1ef7a0bba137b2f806a33be2c51d25b7' 
  AND token = 'a0h3vLsxxADmzzu5ODfuymfB5JXWsCg57ee4oBMGoH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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