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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ee9b311dd41f613db9f8b467c86b6549eed1a16caf37ef6f1a977745a8901d' 
  AND token = '1kdTJtRE3DYNrsnKU5XV3rN0ukaE2tN4RtNwP3MPCe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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