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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0d569dd408972c88dbf3b25fc9d9ab77ca6f156c485e2675f9c917367dd3bc9' 
  AND token = 'h6wCul4GNiTUaf1Dcfsw7npyLr3HyOsXpKGMM6Ni/HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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