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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a0a5ed99cc7d882c54b1e7bc98a03f91c5f3f9cbd288c1b1ef30a0187bb2763' 
  AND token = 'XcPWg3nqFvYfsmV53A6nWzLoFBr7wWBqceA378ptlQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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