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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4879f1e458c0bbc35c5f605b4eba21384a17d1452d7bb22d3e0b4dea8d84904e' 
  AND token = 'hylAPooCbt5MNTk3ieDknwLZ6c6zm7R4ljnQZE1+/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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