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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '663b20e73897c081573ef16243a695000e83fed3556aa8345aa42c5d2b12a5f9' 
  AND token = 'q3hlvfbfyeufxvW9W5Y5Fx08GY6xf2A7OMKiCk6zJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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