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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19b2f82bbf1ada596215216d0e47ba3f70ef2e7a6b9592c0241a299380dd4366' 
  AND token = 'hE93Gk0oHngcIohDPt0gVvZHvWgHl4bS2JqGqHLa64M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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