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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9832eb8ec14c7e1e85b8cc0a114e870f0d1aad884f56dec50f08eff3cfcf0a5' 
  AND token = 'oZw/DhT23qiDp6AENbs485Rgp3SjpFvuHL7kv0XuUwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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