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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7f6024ca71c71da48750f202e6531fee711ff93e31acd74a8419b35ea215bc9' 
  AND token = 'hZdAQ7cWalJFiyEE6V4WyPq7GFKU0e6/nvSfUTYgho8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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