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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b1dd5b08e5e6e86d462d7fd6e30f21b29a7e2209ae15b051adb2aa0373acd6' 
  AND token = 'Ktli+Tc1GCnMgFp941PAxkQBAJwcMgr7IhdXEnj48tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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