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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cb2f93dc04eb1942827d0e8183e3e5a7653efe12019db2e267ba3a2593a803e' 
  AND token = 'jYDLbbcyE8txilC86+JcAMqUr7lOGgGGxM2189vxOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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