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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c68c0379eb93e751bad0711ac370a670bddaca974d5bfabe2237d211aae1b10' 
  AND token = 'qX8JTrUmglqDnLJbS3ysPe2PUoO+qD9tducDw2L/OAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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