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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8cde3361e3d5eaf6278f2164c0e8636f0215e718f679c770ca06f2a206eeb03' 
  AND token = 'c98VkzoRTfHE0vtU5tnoqks9jmp5t7oCFGjYgzeVvTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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