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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27f184f089f80f7917eb16223ef3c0a459fd3acdc6db806c3bd154faa02e72eb' 
  AND token = 'oFXj6fW1XD6D8d9/jDSepzyj3rUB4ybI1LUy+op5A/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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