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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cb4186f63b3e4cbd2d00a690ec5c7f9a022afd86faede9ba5c0a8fbcc68df84' 
  AND token = 'vF5f8Dq3GjkzybaXw3wKqRdyYaLFTllN72s1PPJJjJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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