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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe8bf4093aba172f8c8242f3df2919174abc6fcf1219de16228dd19ed3c7341e' 
  AND token = 'rMYGiHbgLH3YCwxf7bP6IgOvK7+aFFrWEuc9sapCFS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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