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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ef8707ebae2830b92f3d65c63b2ed405d3a7dad56d54dd9e1d13f9c7bc74d0' 
  AND token = 'CfdnzGd4hM4+9uOlHKOIeS4BpdCPtYXabhrxdiiePyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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