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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e6cf1403933b44fa9f04db077cff26b68802011195321e42d85dc356ba3164b' 
  AND token = '4dvZ0pnkosesefgN70ixKTKH8jg1+Cqorj9VMfMDXjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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