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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05e39d4f2530efa4b4a8d410759d2e5e6a494689ddcfdb35f27478e347d3ead2' 
  AND token = '50/G8ADt6oJcFc6kp1FhvLc/GmAFmEddOOTpbKY9uHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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