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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c5b10ca50a3fcad96c0877f089b828ba008ed4d0d0b990e033cd934ed60030' 
  AND token = 'K+8hflvI++QdPFVmu1XnSfyOKrgfF1XQlqy2guvBX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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