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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c13d51c68f7c34633f5d0d82a39351d7c5cdb683c857341eac9fb8b3d79c1d5e' 
  AND token = 'LQ+KqQDbGCIPqlfpnQMu93qR87Do9G2ZdXyzgoeCToY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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