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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcb67b275f2a6e72aaea55ecd8bcbfb16ce93149a57dc29e123ef4e91a50c3a3' 
  AND token = 'ygpFL1PoJXx6vJ4v6TX4/mZ8SOl4LH81HLiG17mqAJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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