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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f997ff8be969ba71d7abac35241bd902a0587f1c03cfc3ee38e24fbcdb5a27ca' 
  AND token = 'TCOiyoTf2Q2M//a/+wE1fFWi26yOvOjmMqKbD6/Rlxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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