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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa8adf4dc8066ae7daa0d8fa00d86397bee971cd15d2ee312ffed18e58a35eb6' 
  AND token = 'RUxsIimI1CCDuUQIZII2fHVwiiIO9U4YzlfFV7wajdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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