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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10b59a2e7f84cfb348945bd1e037d12ae9304f17023cca1243e06ecace2a2f65' 
  AND token = 'p81HpEaSJAPgJhgj98LEurRWDKEhPIcHal9UIQ5c/Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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