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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c54539dd8a0f06fa76e9fa581ac434d6ee52af5c08b0ef04aaba77dda5dfc9' 
  AND token = 'n+pwUIlXn1TZ6tb4fR/HRSOKvuy4F2cbvQycW/5+77I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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