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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c946dfcc581de70bfbd2e8a4981171f73518fc84ba5cd06d2ad3487c8152469' 
  AND token = 'HdGEJGzcK0IXh1DJY1aO+0AblfxlBKaTM5SbZkNPPGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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