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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dee46a199bc1e47fa00abcadda842e8a5f29031f7b75448830b9633b17d81cec' 
  AND token = 'S96Rsl80eN6qVJKGxZfvjtPt3PzqrtWa06KYFCmtQNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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