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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '143d7cce3529e891a631ba8ce8450ed4c14b817614ea43ec5ef4208953f6e87f' 
  AND token = 'NaC9p9ogkoq3n1MkTwYUoLXdEeaR+BrTBVYCyos7TKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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