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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ee51a965129a840eeb4365a4a269c8d92233570e9db7c7665f988ad8a26a2d7' 
  AND token = 'WqYl3hkhimR1d6JNlkTFi8/tIk3fnJnrVELwxu/YWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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