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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb4fd17a23377da558cd6869ef5aade187586c76b91f756de724e61b6716c2e' 
  AND token = 'W2xp1i9Lld8lpqQYLRWz7Dc6Cq/3H8pWV56DPeRE6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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