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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4e9520735acd2d691a57aa0774ca825edecb3bd1c0341346326bed0cd9162d0' 
  AND token = '+6Bb18jJtno6RbQskCYC+yj98QZn7NzayFIGPxdu4VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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