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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b0b9aacac55dd289e6f2a3ad9e1215a7fd342b056fcdb6b8195444bb0aad168' 
  AND token = '/pOGJwjpuGThOQ7uYtebi1xb1+YtQlF5rh+e1w9YUvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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