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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a60b7e5fbab2e4c80ded40f17b688accb6fee9e160e1857a4ab23fd44d05266' 
  AND token = 'NmnNz9m5PYI3yyqhxyKu4YpUNAKno7Uu4MgUKf1IG10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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