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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f7c8fa2293c24eef0ce1d46f7d17e92811fb396e50a560f441fc52bacb9ae42' 
  AND token = 'IC10HVmdDP7XEdAVIR5M9+APgHQ79y61pijKTO/WGRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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