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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80826954a360c9b8fa8ed984aee6368dda0e4474696e86f1fe8d7a9a4f933a71' 
  AND token = 'v2phD3cyNYd4jD3+U2+KuWYeAexTiXPtxfqbMYGrImk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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