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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71675969c9743315eafe0c3e6d34473f38b84d4883e084ed9179238e8dbac6e7' 
  AND token = 'ixeBtiwYS74//fRvUUt0bi8a8koDyP6qQrzH2Bj6SR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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