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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87ca816850fe43b4a2d56e8aaa9c3caf3d2406af8f831c12d55852c7c2f11603' 
  AND token = 'ylnMxmhlQNXV/A9M3OV/77c+p9eyc+fW9KHKZeWf7CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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