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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd5afc8e7c13f2169548ec2deb34b4639267854460931901e970294475efe6c1' 
  AND token = 'xG0Pu843P4OYfgE90ejB8g4eB4Q4z+jxxi3ofToNx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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