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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bddef994d0bc4162b6063492f72c0332f5fd3629621f6513828ddb5b6ab2f721' 
  AND token = 'nLfAjHYw6bpSEAdoGAO4Bf8xyBQhUlu2/8nPaSSN0Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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