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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acad30e4aae109d159ee30af8814d058cfbfdbbe01ee167a34c93aacc946025c' 
  AND token = 'mek8QVQPbFEvds3Hlpwx9FKc1AoMHzMpjwk3Lp5P9ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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