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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f0ce0cdb4fc4073f7962a00de6c7149d0cc68407293e350a901670ce8886db' 
  AND token = '0Lh3vEm1a4UfU5OahIOp9p86TLPcjkbt9b0yHAOFilQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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