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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f7617e3142be02c2fa2b2c1e9fdc3fa646448eb46e1e3da6a35fde3380e9ccf' 
  AND token = 'Ntks5kCR+Xq+MdQUT17Qw62uXhvEcav6A3jj3Ojmo3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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