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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '855be7ffddef0f32869ae47157ef9dcb257dd0464363b4c6a945344ec9353f4c' 
  AND token = 'muovuqE9JB47Soye/lpZ1d/qDIrPHXoCd1mHOeLpxNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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