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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c5675cd53674412b943304084d0f514f77b6ae0977a4b4f4a6892ab169b001b' 
  AND token = 'CYSSiBDymayG+EHbxDNRD1VfsY4r3QxtKd6ydPYhs48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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