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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '575ffc67761eec86bbdf674e038e99ef5ad1daf3e9b2f3f4a245edad67fbe32e' 
  AND token = 'DU3RXBIcHhn6zsP8KaqO7LQfR9HCdXIIT/Vx6DIiYB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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