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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f0b25e0a92c52ab1aa9128c3268a9f56599ac85fd9ab70923a04fbf14cdd72b' 
  AND token = 'p/N2+yR2R/ccHggncccwTdiziHFgYQeBWu10N+o4DQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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