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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ecd870719510891061669997cf346e2f0b8679feb5f8e1d5be8327a1cffde03' 
  AND token = 'jMj8k0eqNRZc3RRarN001/2XnS4p4q/m6OBXjwivph8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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