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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '938b8fcc51742dd3cea0f655d47775662f38be84ac71a48b19eff480d81b615d' 
  AND token = 'SJN3aUUvDAhqdsmw6RSJ5Cn6oIFgyA+akmHmWhfPaFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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