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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '967b6d330fdbea1be4d335db75dc9017a1ed4f54a8ceef1400ae87fac4f1a5aa' 
  AND token = 'MyFCnsq9rmcrcYaQe7ld0MIvgc+s/n06bS3yE8l43pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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