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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '187343033c2558a38435142d985b617fbb76c96ded051e723097e01e8b182b37' 
  AND token = 'Y9G3UoVDENgfhLe3pA0dPm41virSAoqkMbJGTGXOjbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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