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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ca7fb50379967fbdd64ad5944141489f4dee7bb517b8e3dcaa8a8d8f14e8a9' 
  AND token = 'RHMb2p8wgfxdsYsFvj4keYDP/rMXLtl7SclWmjeV0IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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