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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e372b482e1da5fbaf75ca3e9eb95fd293e3a88b07c10c00d3ae9e84a3c3ef32' 
  AND token = 'fCNdUXeHv9rU5+j/oVqi+tEKQcvP0ifBJSNQEcnW3Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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