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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5455e4dbfe049b4e79919c73e602b5817a653895c4ff3c61a7301dfb9d98f5a' 
  AND token = 'vRopfc2aspAztDfBFbRrRblShlyYPSl5nTZYDycSLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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