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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08737945a4f3ff7c6baae0064668bf4bcfc5de58de7da68739d091e4c7a0c58a' 
  AND token = 'pO732imFDbpho24YzRu9JyR6kzRnDRKORQP7kHrLyXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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