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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9992ee984795f7f21fd1d99cb3d4c5e3abec3c0158cd71f4e0ff72a991c6802d' 
  AND token = '4cYsoOkGPlTzf4sTW3/r8j9XYGy57ZVeE922jvyCzcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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